Have you spotted black streaks or green blotches on your roof?
That’s probably algae, and it’s more prevalent than you realize
particularly on asphalt shingles. Algae may not hurt your roof
right away, but it can give your roof a dirty appearance, decrease
the value of your home, and, in the long term, degrade your
shingles’ performance. At Straight Path Construction, we assist
Calgary residents in maintaining clean-looking roofs that last longer.
Here is how you can stop algae growth on your asphalt shingles.
What Makes Algae Grow on Roofs?
Algae growth is often caused by moisture, shade, and organic
material like dirt and leaves that settle on your roof. Algae spores
can be carried by wind and rain, and once they land on your roof,
especially in humid or shaded areas they begin to grow. In Calgary,
algae are more likely to appear on the north-facing side of your
roof, where there’s less sunlight to dry out moisture.
Choose Algae-Resistant Shingles
One of the most effective ways to keep algae away is to use
algae-resistant shingles. These shingles have minute amounts of
copper or zinc, which naturally inhibit the growth of algae. This
option is provided by many large manufacturers at minimal or no
extra charge. At Straight Path Construction, we highly suggest these
shingles particularly if your home is in the shade or you’ve
had issues with algae in the past.
Keep Your Roof Clean and Dry
Keeping your roof regularly maintained prevents algae growth.
Ensure your gutters are in good working condition and are clear
to direct water off the roof. Keep tree branches trimmed so less
shade is created, letting the sun dry out the shingles. Don’t allow
leaves and debris to accumulate in roof valleys or vents, either. A
dry, clean roof is much less likely to draw algae.
How Calgary’s Climate Impacts Algae Growth
Although Calgary is not as humid as cities by the sea, algae can
still develop in wet times of year, particularly spring and autumn.
Houses with trees around them or that have shaded parts are more
likely to experience algae growth. Roofs that don’t receive enough
sunlight to dry out rapidly following rain or melting snow allow
algae spores to propagate. This is why it’s wise to take preventive
measures even if you live in a cooler, drier area like Calgary.
Routine Roof Inspections Aid in Catching Algae Early
The ideal way to prevent algae damage is by catching it at an
early stage. An annual roof inspection enables experts to identify
signs of algae before the issue becomes more significant. Free
roof inspections are provided by Straight Path Construction in
Calgary and the surrounding areas. If early indications of algae
are detected, we can suggest the optimal solution either cleaning,
the application of protective strips, or replacing your shingles.
Install Zinc or Copper Strips
Another efficient choice is having zinc or copper strips installed at
the ridge of your roof. When rain comes, tiny pieces of metal wash
across the roof and drop algae spores before they get a chance
to grow. This is a useful addition for roofs that do not currently
have algae-proof shingles. Our staff at Straight Path Construction
can install these strips with a new installation or as an added
feature for a maintenance upgrade.
Don’t Power Wash Your Roof
If you already have algae, you may be inclined to shoot it off with
a power washer but don’t. Power washing can strip the protective
granules off your shingles and reduce your roof’s lifespan. Instead,
use a soft roof cleaner or hire a pro for safe algae removal. We can
inspect the health of your shingles and clean them safely without destruction.
Final Thought
Algae on asphalt shingles is an avoidable but all-too-common
issue. With the proper materials and minimal upkeep, you can
maintain a wonderful-looking roof that will also live longer. At
Straight Path Construction, we assist Calgary homeowners in
making algae-resistant selections that perform either on a new roof
or routine maintenance.
Contact us Now
Want to save your roof from algae?
Call Straight Path Construction today or go to our website to
arrange a free roof inspection. We’ll assist you in making the right
decisions to make your roof clean and healthy.
Frequently Asked Questions (FAQs)
Why does algae grow on my roof?
Algae thrive in wet, shady spots where leaves, debris, and moisture
accumulate. It grows most frequently on north-facing roof areas
that are slow to dry out.
Will algae hurt my asphalt shingles?
While algae don’t typically cause immediate damage, it can discolour
your shingles, decrease curb appeal, and shorten roof
lifespan in the long run if not treated.
What are algae-resistant shingles?
Algae-resistant shingles contain copper or zinc particles that naturally
repel algae growth. They’re an excellent option for long-term defence.
Can I clean algae off my roof myself?
You may use soft roof cleaners but don’t power wash, which can harm
your shingles. For optimal results, have a pro clean your roof safely.
Does Straight Path Construction install algae-resistant roofs?
Yes! We provide algae-resistant shingles and add-on zinc or copper strip
installation. We have roof inspections and safe cleaning options.
